[[20, 2, 2, 5], [20, 2, 2, 5], [40, 2, 2, 2, 5]]

So, I know dictionary can be used in some of cases. But how will I do it? I want to add the first element to the inside list if two element is complete similar So the solution will be:

[[40,2,2,5],[40,2,2,2,5]]

CodePudding user response：

One way is to add each row to dictionary (in the key part). The dictionary will remove all the duplicates. Another way is to add all the rows to a set. And then convert it back to a list . Duplicates will be gone as set removes duplicates.

CodePudding user response：

Creating a empty list, then using if element not in list: list.append(element).